Purpose: To asses the efficacy adn safety of deep sclerectomy versus trabeculectomy. Setting Bilateral randomized trial. Methods: 8 patients (16 eyes) with bilateral primary open-angle glaucoma were included in the study. Eyes were randomly assigned to receive nonpentrating glaucoma surgery with SK-Gel implant in one eye and trabeculectomy in the other eye. Patiens were in- Methods: 8 patients (16 eyes) with bilateral primary open-angle glaucoma were included in the study. Eyes were randomly assigned to receive nonpentrating glaucoma surgery with SK-Gel implant in one eye and trabeculectomy in the other eye. Patiens were in-